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During your experience of the real meaning of the Rub al Khali, you will certainly look and find ‘geodes,’ rocks that are not only geological wonders, they still are of some scientific interest to geologists. Normally, geodes are small hollow rocks lined with crystals. They are common in active volcanic areas of the world. The ‘Dhofar geodes’ differ from these. These geodes are found as hard round balls of rock lying loose in stony desert areas and somewhat surprisingly around the strand lines of dry lakes. Many of the geodes are hollow with thin airtight hard silica shells (quartz). When broken open they have interiors lined with elegantly shaped quartz crystals.